New transcient, perhaps a nova

Information about outbursts of eruptive stars, Be activity, ...
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Olivier GARDE
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Location: Rhône Alpes FRANCE
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Re: New transcient, perhaps a nova

Post by Olivier GARDE »

Last spectrum of this nova taken last night with a poor sky at the horizon.
The magnitude still remain at the same level and no more evolution on the velocity, but the small "bump" in the absorption line grows every day.

Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Christian Buil
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Re: New transcient, perhaps a nova

Post by Christian Buil »

Spectre fait avec un petit diamètre (FSQ106ED - 106 mm) et une caméra ASI290MM (capteur CMOS) sur Alpy600, avec ce que j'avais sous la main à l'OHP, ou ce déroule actuellement l'école de spectroscopie :

Image

Image

Voir aussi pour le setup et conditions le fil :

http://www.spectro-aras.com/forum/viewt ... 8845#p8845

Christian B
Michel Verlinden
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Re: New transcient, perhaps a nova

Post by Michel Verlinden »

Bonjour Christian,
C'est un spectre fin, qu'obtiens-tu comme rapport signal à bruit sur les raies dans le bleu avec la camera ASI 290MM, par rapport à une CCD sans changer le reste du setup ?
Bien cordialement,
Michel Verlinden
umberto sollecchia
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Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Bonjour à tous, le week-end passé, moi et Paolo Berardi nous sommes allés à un camping astronomique sur le Gran Sasso à 1600 mt. Dans la nuit du 22/07/2017,nous avons observé la nova aussì avec photométrie.
Voici le profil spectral calibré dans le flux absolu.
Umberto
Profilo Nova Flux.png
Profilo Nova Flux.png (11.21 KiB) Viewed 7097 times
Profilo nova flux 2.png
Profilo nova flux 2.png (20.97 KiB) Viewed 7096 times
Francisco Campos
Posts: 88
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Re: New transcient, perhaps a nova

Post by Francisco Campos »

Bonjour à tous,

très bons tous ces spectres. On doit continuer la surveillance parce que la nova est en train de monter fortement de magnitude: elle n'a pas encore atteint le maximum.

Bien cordialement,
Fran
Tim Lester
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Location: Arnprior Ontario

Re: New transcient, perhaps a nova

Post by Tim Lester »

The nova has brightened significantly. Here is my result for July 26 with my new echelle.
novasct2017_20170726_086_tlester_1.png
novasct2017_20170726_086_tlester_2.png
novasct2017_20170726_086_tlester_3.png
novasct2017_20170726_086_tlester_4.png
novasct2017_20170726_086_tlester_4.png (29.63 KiB) Viewed 7068 times
Tim
Paolo Berardi
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Re: New transcient, perhaps a nova

Post by Paolo Berardi »

Hi all! Fran, thanks for your comment. Very nice echelle spectrum Tim! I can confirm the extremely high brightness of the nova. Yesterday I measured V mag 9.15 at ~ 21 UT. Even with 1200 l/mm grating, the continuum is very intense and shows clearly the telluric lines in the H-alpha region (removed in the plots below).

Image

Image

Absolute flux calibration is obtained by rescaling the continuum to a low-res fluxed spectrum taken by Umberto (Alpy 600) at the same time.

H-alpha P-cyg profile changed again. The double absorption minimum seems gone. The heliocentric velocity of minimum is ~ -305 Km/s. The same measurement for Si II doublet return ~ -220 Km/s. Fe II 6456 Rv is ~ -235 Km/s.

Prof. Taichi Kato (who is looking at ARAS spectra, ref. VSNET ml), talks about a similarity of ASASSN-17hx evolution with the old nova V723 Cas.

Paolo
umberto sollecchia
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Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Bonsoir, hier soir, je remarquai la nova. Voici deux profils, le premier calibré flux absolu 12x360, et l'autre 23x360, en intensité relative parce que la photomètrie ne couvre pas tout au long de l'intégration.
Profilo nova flux.png
Profilo nova flux.png (10.15 KiB) Viewed 7052 times
Profilo nova .png
Profilo nova .png (9.18 KiB) Viewed 7052 times
Umberto
umberto sollecchia
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Re: New transcient, perhaps a nova

Post by umberto sollecchia »

Bonjour à tous, placez le profil d'osservazione de la nuit du 26-07-2017. La nova est encore augmentée par magitudine,maintenant mesurer 8,86.
Umberto.

Profilo nova flux.png
Profilo nova flux.png (9.8 KiB) Viewed 7012 times
Francisco Campos
Posts: 88
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Re: New transcient, perhaps a nova

Post by Francisco Campos »

Very interesting all the spectra.

Here is a comparison of two spectra, from July 22th and yesterday. The brightening began 3-4 days ago and the changes are dramatic!
Comparativa 4 dias.png
Comparativa 4 dias amp.png
Greetings
Fran
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Comparativa 4 dias amp.png
Last edited by Francisco Campos on Thu Jul 27, 2017 6:22 pm, edited 1 time in total.
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